Answer
$D=\{(x,y)\in\mathbb{R}^2|x^2+y^2>9\}$
Work Step by Step
The value inside the logarithm must be greater than 0. Therefore, $x^2+y^2>9$, which is all points outside the circle with center at the origin and radius 3.
$D=\{(x,y)\in\mathbb{R}^2|x^2+y^2>9\}$
